Microsoft Outlook users store in Exchange Server’s contact folders addresses. This can be done in a personal mailbox, in a shared mailbox or in a Public Folder. While contacts from the personal mailbox will be often synchronized to the Mac OS X Addressbook and other targets by Microsoft ActiveSync, the contacts of other mailboxes and Public Folders are not accessible on mobile devices. PeopleSync is able to synchronize the contacts including email addresses, phone numbers and even the profile pictures from Exchange Server and Office 365 Exchange Online.

The Apple Mac OS X operating system comes with several applications for Mail, Contacts and Calendar. The apps support the synchronization with several consumer and corporate email systems. With messageconcept PeopleSync and the native CardDAV support of Mac OS X a synchronization with Exchange Contact Folders and other systems to the Mac is also possible. This makes contact data from these sources available in the Mail app and all other applications, relaying on the Mac OS X Addressbook.